How we keep it cool

The inside of a BreezyPack stays between 25–27°C (77–80°F), keeping your medicine safe without any risk of freezing.

Our BreezyPacks use Phase Change Materials, or PCMs that adjust to the temperature around them.

Below 24°C (75°F), the case stays fully charged. When it gets warmer than 27°C (80°F), it automatically activates to keep your medicine safe.

Once the temperature drops back to 24°C (75°F) or lower, it recharges on its own, no electricity, fridge, or soaking in cold water before each use.

 

The science to keep it cool

At the core of BreezyPacks are special materials called Phase Change Materials (PCMs).

They work a lot like ice: when ice melts, it absorbs heat from its surroundings, making them cooler. When it freezes again, it releases that stored heat.

PCMs do the same thing, they take in energy when they melt and release it when they solidify, starting as soon as the temperature drops below their set point.

 

Our PCM has some practical difference compared to ice:

Our PCM solidifies at 27°C (80°F).
That means it can “freeze” at normal room temperature, no freezer needed.

It’s ideal for keeping your medication below 30°C (86°F) and lasts much longer than ice. Ice melts quickly in the heat because its melting point is far below the surrounding temperature. Since our PCM’s melting point is much higher than ice, it stays solid much longer in hot conditions.

And just like ice can freeze and melt over and over without wearing out, our PCM can do the same, it doesn’t degrade and can last indefinitely.

How it’s built

Inside each BreezyPack, the PCM is sealed in thick, metallicized polymer bags, similar to Mylar®, that are highly durable and virtually leak-proof. These are tucked into special pockets in the lining, so you’ll never need to see or handle them.

There’s also an insulating layer made from recycled felt, which helps the BreezyPack stay cool for longer in the heat.

Everything is wrapped in linen canvas, a strong, eco-friendly fabric that uses less water and fewer pesticides to grow than cotton. We believe these details make a difference.

 

How it’s tested

The development of BreezyPacks started on a piece of paper, with theoretical heat transfer calculations and chemical formulas.

From there, we moved to lab testing. Every new model, and every production run, is tested in controlled conditions. We place 2–4 sensors inside the pack to track temperature changes every minute, along with extra sensors outside in our test setup. We check how long the pack stays cool, how much heat it can handle, how quickly it regenerates, and more. It’s surprising how much engineering goes into something that looks so simple!

Quality control is ongoing. Each batch of PCM is melted and tested for consistency, and every pack is inspected for leaks or defects after assembly.

Finally, we listen closely to our users. Every piece of feedback is passed to our lab team so we can keep improving our products and developing new models to meet your needs.

 

 

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